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What is the difference in meaning between these following sentences:


1. My eighteenth birthday was the worst day I had ever had.

2. My eighteenth birthday was the worst day I ever had.

3. My eighteenth birthday was the worst day I have ever had.

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Hasibrahman1. My eighteenth birthday was the worst day I had ever had.

Ungrammatical sentence. It is not valid.

Hasibrahman2. My eighteenth birthday was the worst day I ever had.

OK sentence.

Hasibrahman3. My eighteenth birthday was the worst day I have ever had.

Better sentence.

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This is the website from where I got the first sentence: https://learnenglish.britishcouncil.org/english-grammar-reference/past-perfect#comment-149892

You have to give the source for your sentences.
Some constructs, out of context, are quite unnatural.

AlpheccaStars
Hasibrahman1. My eighteenth birthday was the worst day I had ever had.

Ungrammatical sentence. It is not valid.

Here is the sentence in an appropriate context:

Up until the break-up with my girlfriend last Friday, I thought that my eighteenth birthday was the worst day I had ever had.  Boy, was I wrong. Last Friday was certainly the worst day I have ever had. 

Are there any differences in meaning between these two sentences?

1. Lionel Messi: "Ronaldo is the greatest striker I ever saw"

2. Lionel Messi: "Ronaldo is the greatest striker I have ever seen".

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The second is more common.